Could you provide us a tracker ID? When the issue occurs, just press the Home button 5 times, followed by the Back button 5 times.
Moreover, since you have tried all the possible troubleshooting steps but the issue persists on one channel, contact the channel's customer support team to report the issue and get help. Many channels on Roku are developed and maintained by the channel provider themselves. There's likely an issue within Paramount Plus that needs to be addressed with an update from therm.